/* ------------------------------------------------------------------
   House of Research
   Monochrome system drawn from the logo:
     #202020 ground, #FFFFFF, #D3D5DF pale grey, #6A6B6E mid grey
   No hue anywhere. Hierarchy comes from weight, scale and space.
   Type follows the logo's rounded geometric character.
   ------------------------------------------------------------------ */

:root {
  --paper:      #FFFFFF;
  --band:       #F4F4F5;
  --surface:    #FFFFFF;

  --ink:        #1C1C1C;
  --ink-2:      #3D3D3F;
  --ink-soft:   #5C5C60;
  --ink-faint:  #9A9A9E;

  --rule:       #E6E6E8;
  --rule-2:     #D3D5DF;

  --btn-bg:     #1C1C1C;
  --btn-ink:    #FFFFFF;

  --mark-filter: none;

  --f-display: "Quicksand", "Avenir Next", "Century Gothic", sans-serif;
  --f-body:    "Nunito Sans", "Avenir Next", system-ui, sans-serif;

  --measure: 33rem;
  --wrap: 72rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:      #1A1A1A;
    --band:       #202020;
    --surface:    #242424;

    --ink:        #F5F5F6;
    --ink-2:      #D8D8DA;
    --ink-soft:   #A5A5A9;
    --ink-faint:  #79797D;

    --rule:       #323234;
    --rule-2:     #3C3D42;

    --btn-bg:     #F5F5F6;
    --btn-ink:    #1A1A1A;

    --mark-filter: invert(1);
  }
}
:root[data-theme="dark"] {
  --paper:      #1A1A1A;
  --band:       #202020;
  --surface:    #242424;

  --ink:        #F5F5F6;
  --ink-2:      #D8D8DA;
  --ink-soft:   #A5A5A9;
  --ink-faint:  #79797D;

  --rule:       #323234;
  --rule-2:     #3C3D42;

  --btn-bg:     #F5F5F6;
  --btn-ink:    #1A1A1A;

  --mark-filter: invert(1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink-2);
  font-family: var(--f-body);
  font-size: 1rem;
  line-height: 1.72;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }
a { color: inherit; }

:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--btn-bg); color: var(--btn-ink);
  padding: .6rem 1rem; z-index: 100; font-size: .875rem;
}
.skip:focus { left: .5rem; top: .5rem; }

.wrap {
  width: 100%; max-width: var(--wrap);
  margin-inline: auto; padding-inline: 1.5rem;
}

h1, h2, h3 {
  font-family: var(--f-display);
  color: var(--ink);
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; }

.label {
  font-family: var(--f-display);
  font-size: .6875rem;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0;
}

.lede {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: var(--measure);
  margin: 0;
}

/* ---------- masthead ---------- */

.masthead {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: saturate(120%) blur(12px);
}
.masthead__in {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1.5rem; padding-block: 1rem;
}
.wordmark {
  display: flex; align-items: center; gap: .625rem;
  text-decoration: none; white-space: nowrap;
}
.wordmark img {
  width: 2rem; height: 2rem;
  object-fit: cover; object-position: 50% 30%;
  filter: var(--mark-filter);
}
.wordmark__names { display: flex; flex-direction: column; line-height: 1.2; }
.wordmark__name {
  font-family: var(--f-display);
  font-size: 1.0625rem; font-weight: 600;
  letter-spacing: -.005em;
  color: var(--ink);
}
.wordmark__studio {
  font-family: var(--f-display);
  font-size: .6875rem; font-weight: 500;
  letter-spacing: .15em;
  color: var(--ink-faint);
}

.nav { display: flex; align-items: center; gap: 1.75rem; }
.nav a {
  font-family: var(--f-display);
  font-size: .875rem; font-weight: 500;
  color: var(--ink-soft);
  text-decoration: none;
  transition: color .18s;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
@media (max-width: 56rem) { .nav { display: none; } }

.btn {
  display: inline-block;
  font-family: var(--f-display);
  font-size: .8125rem; font-weight: 600; letter-spacing: .02em;
  padding: .7rem 1.35rem;
  background: var(--btn-bg); color: var(--btn-ink);
  border: 1px solid var(--btn-bg);
  border-radius: 999px;
  text-decoration: none; cursor: pointer;
  white-space: nowrap;
  transition: opacity .18s;
}
.btn:hover { opacity: .82; }
.btn--ghost {
  background: transparent; color: var(--ink);
  border-color: var(--rule-2);
}
.btn--ghost:hover { border-color: var(--ink); opacity: 1; }
@media (max-width: 30rem) {
  .masthead__in { gap: .75rem; }
  .masthead__in .btn { font-size: .75rem; padding: .6rem 1rem; }
  .wordmark__name { font-size: .9375rem; }
  .wordmark__studio { font-size: .625rem; letter-spacing: .12em; }
  .wordmark img { width: 1.75rem; height: 1.75rem; }
}

/* ---------- sections ---------- */

.sect {
  display: flex; flex-direction: column;
  gap: clamp(2.5rem, 5vw, 3.75rem);
  padding-block: clamp(4.5rem, 10vw, 8.5rem);
}
.sect__head { display: flex; flex-direction: column; gap: 1rem; max-width: 40rem; }
.sect__head h2 {
  font-size: clamp(1.875rem, 4.2vw, 2.875rem);
  font-weight: 500; line-height: 1.14; letter-spacing: -.015em;
}

/* ---------- hero ---------- */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, .46fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
  padding-block: clamp(3.5rem, 8vw, 6.5rem) clamp(3rem, 6vw, 5rem);
}
.hero__text { display: flex; flex-direction: column; gap: 1.5rem; }
.hero h1 {
  font-size: clamp(2.125rem, 5.2vw, 3.625rem);
  font-weight: 600; line-height: 1.06; letter-spacing: -.03em;
  max-width: 16ch;
}
.hero h1 .soft { font-weight: 300; color: var(--ink-soft); letter-spacing: -.025em; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: .4rem; }

/* the four situations, as a full-width band beneath the hero */
.situations-band {
  display: flex; flex-direction: column; gap: 1.5rem;
  padding-bottom: clamp(3rem, 6vw, 4.5rem);
}
.situations-band__intro { font-size: 1.0625rem; color: var(--ink-soft); }
.situations {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.75rem;
}
.situations li {
  border-top: 2px solid var(--ink);
  padding-top: 1rem;
  font-family: var(--f-display);
  font-size: 1.0625rem; font-weight: 500;
  line-height: 1.35; color: var(--ink);
}
@media (max-width: 52rem) { .situations { grid-template-columns: 1fr 1fr; gap: 1.25rem 1.5rem; } }
@media (max-width: 30rem) { .situations { grid-template-columns: 1fr; gap: 1rem; } }

/* hero figure, with the studio's letterforms drifting behind it */
.hero__fig { position: relative; justify-self: end; max-width: 17rem; width: 100%; }
.hero__fig img {
  display: block; width: 100%; position: relative; z-index: 1;
  filter: var(--mark-filter);
  -webkit-mask-image: linear-gradient(to bottom, #000 66%, transparent 100%),
                      linear-gradient(to right, transparent 0%, #000 16%, #000 93%, transparent 100%);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(to bottom, #000 66%, transparent 100%),
              linear-gradient(to right, transparent 0%, #000 16%, #000 93%, transparent 100%);
  mask-composite: intersect;
}
.hero__glyphs {
  position: absolute; z-index: 0;
  right: -1.25rem; top: 16%;
  font-family: var(--f-display);
  font-size: clamp(3.5rem, 7vw, 5.5rem);
  font-weight: 500; line-height: 1.05;
  letter-spacing: .02em;
  color: var(--ink);
  opacity: .17;
  filter: blur(4px);
  display: flex; flex-direction: column; align-items: flex-start;
  pointer-events: none; user-select: none;
}
@media (max-width: 52rem) {
  .hero { grid-template-columns: 1fr; }
  /* figure moves to the left so the glyphs still sit to its right and stay on screen */
  .hero__fig { justify-self: start; max-width: 10rem; }
  .hero__glyphs { right: -3rem; top: 12%; font-size: 2.75rem; filter: blur(3px); }
}

/* reference strip */
.refstrip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 1.75rem 2.5rem;
  border-top: 1px solid var(--rule-2);
  padding-top: 1.75rem;
  padding-bottom: clamp(3.5rem, 7vw, 5.5rem);
}
.ref { display: flex; flex-direction: column; gap: .3rem; }
.ref__k {
  font-family: var(--f-display);
  font-size: .625rem; font-weight: 600;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-faint);
}
.ref__v { font-family: var(--f-display); font-size: 1rem; font-weight: 500; color: var(--ink); }

/* ---------- services ---------- */

.svc-list { display: flex; flex-direction: column; }
.svc {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 17rem);
  gap: 1.25rem 3rem;
  padding-block: clamp(2rem, 4vw, 2.75rem);
  border-top: 1px solid var(--rule);
}
.svc:last-child { border-bottom: 1px solid var(--rule); }
@media (max-width: 52rem) { .svc { grid-template-columns: 1fr; gap: 1rem; } }
.svc__body { display: flex; flex-direction: column; gap: .5rem; }
.svc__stream {
  font-family: var(--f-display);
  font-size: .625rem; font-weight: 600;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-faint);
}
.svc__body h3 {
  font-size: clamp(1.25rem, 2.6vw, 1.625rem);
  font-weight: 500; line-height: 1.25; letter-spacing: -.015em;
}
.svc__body p { color: var(--ink-soft); max-width: 44ch; }
.svc__body h3 + p { margin-top: .35rem; }
.svc__out { display: flex; flex-direction: column; gap: .45rem; padding-top: .3rem; }
.svc__out ul { margin: 0; padding: 0; display: contents; }
.svc__out li {
  font-family: var(--f-display);
  font-size: .875rem; font-weight: 500; line-height: 1.55;
  color: var(--ink-soft);
  list-style: none;
}

/* ---------- pillars ---------- */

.pillars { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2.25rem; }
@media (max-width: 52rem) { .pillars { grid-template-columns: 1fr; gap: 1.75rem; } }
.pillar {
  display: flex; flex-direction: column; gap: .55rem;
  border-top: 2px solid var(--ink);
  padding-top: 1.05rem;
}
.pillar h3 { font-size: 1.0625rem; font-weight: 600; line-height: 1.3; }
.pillar p { font-size: .9375rem; line-height: 1.6; color: var(--ink-soft); }

/* ---------- approach ---------- */

#approach { background: var(--band); }

.steps { display: flex; flex-direction: column; list-style: none; margin: 0; padding: 0; }
.step {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 15rem) minmax(0, 1fr);
  gap: .4rem 2.5rem;
  align-items: baseline;
  padding-block: 1.75rem;
  border-top: 1px solid var(--rule-2);
  list-style: none;
}
.step:last-child { border-bottom: 1px solid var(--rule-2); }
.step__n {
  font-family: var(--f-display);
  font-size: .8125rem; font-weight: 600;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}
.step h3 { font-size: 1.125rem; font-weight: 600; line-height: 1.3; }
.step p { font-size: .9375rem; color: var(--ink-soft); max-width: 52ch; }
@media (max-width: 52rem) {
  .step { grid-template-columns: 2.75rem minmax(0, 1fr); gap: .3rem 1rem; }
  .step p { grid-column: 2; }
}
@media (max-width: 26rem) {
  .step { grid-template-columns: 1fr; gap: .3rem; }
  .step p { grid-column: auto; }
}

/* ---------- about ---------- */

.about { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
@media (max-width: 52rem) { .about { grid-template-columns: 1fr; gap: 2.5rem; } }
.about__prose { display: flex; flex-direction: column; gap: 1.25rem; max-width: var(--measure); }
.about__prose p { color: var(--ink-soft); }
.about__prose p:first-child {
  font-family: var(--f-display);
  font-size: 1.375rem; font-weight: 500; line-height: 1.45;
  letter-spacing: -.015em;
  color: var(--ink);
}
.facts { display: flex; flex-direction: column; }
.fact {
  display: flex; flex-direction: column; gap: .15rem;
  padding-block: .95rem;
  border-top: 1px solid var(--rule);
}
.fact:last-child { border-bottom: 1px solid var(--rule); }
.fact__k {
  font-family: var(--f-display);
  font-size: .625rem; font-weight: 600;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-faint);
}
.fact__v { font-size: .9375rem; line-height: 1.5; color: var(--ink-2); }

/* ---------- research projects page ---------- */

.pub-group { display: flex; flex-direction: column; gap: 0; }
.pub-group__label {
  font-family: var(--f-display);
  font-size: .625rem; font-weight: 600;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 1rem;
}
.pub {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: .35rem 2rem;
  padding-block: 1.6rem;
  border-top: 1px solid var(--rule);
}
.pub:last-child { border-bottom: 1px solid var(--rule); }
@media (max-width: 44rem) {
  .pub { grid-template-columns: 1fr; gap: .3rem; }
  .pub__meta { grid-column: auto; }
}
.pub__year {
  font-family: var(--f-display);
  font-size: .8125rem; font-weight: 600;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}
.pub__body { display: flex; flex-direction: column; gap: .3rem; }
.pub__title {
  font-family: var(--f-display);
  font-size: 1.0625rem; font-weight: 500; line-height: 1.35;
  color: var(--ink);
}
.pub__meta { font-size: .9375rem; line-height: 1.55; color: var(--ink-soft); }
.pub__venue { font-style: italic; }

.page-head { display: flex; flex-direction: column; gap: 1.25rem; padding-block: clamp(3.5rem, 8vw, 6rem) 0; max-width: 42rem; }
.page-head h1 {
  font-size: clamp(2.125rem, 5vw, 3.25rem);
  font-weight: 600; line-height: 1.08; letter-spacing: -.03em;
}
.backlink {
  font-family: var(--f-display);
  font-size: .875rem; font-weight: 500;
  color: var(--ink-soft); text-decoration: none;
  align-self: flex-start;
}
.backlink:hover { color: var(--ink); }

/* ---------- contact ---------- */

.contact { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
@media (max-width: 52rem) { .contact { grid-template-columns: 1fr; gap: 2.5rem; } }

form { display: flex; flex-direction: column; gap: 1.15rem; }
.field { display: flex; flex-direction: column; gap: .45rem; }
.field label {
  font-family: var(--f-display);
  font-size: .625rem; font-weight: 600;
  letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-faint);
}
.field input, .field select, .field textarea {
  font-family: var(--f-body);
  font-size: .9375rem;
  color: var(--ink);
  background: transparent;
  border: 0; border-bottom: 1px solid var(--rule-2);
  padding: .55rem 0;
  width: 100%; border-radius: 0;
}
.field textarea { resize: vertical; min-height: 6rem; line-height: 1.6; }
.field input::placeholder, .field textarea::placeholder { color: var(--ink-faint); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-bottom-color: var(--ink);
}
.field select { appearance: none; cursor: pointer; }
.form-note { font-size: .8125rem; color: var(--ink-faint); line-height: 1.5; }
form .btn { align-self: flex-start; margin-top: .4rem; }

.contact__aside { display: flex; flex-direction: column; gap: 1.4rem; }
.contact__aside p { color: var(--ink-soft); max-width: 32ch; }
.maillink {
  font-family: var(--f-display);
  font-size: 1.0625rem; font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-2);
  align-self: flex-start;
  padding-bottom: .15rem;
  transition: border-color .18s;
}
.maillink:hover { border-bottom-color: var(--ink); }

/* ---------- footer ---------- */

footer { border-top: 1px solid var(--rule); padding-block: 2.5rem 3rem; }
.foot {
  display: flex; flex-wrap: wrap; gap: 1rem 2.5rem;
  justify-content: space-between; align-items: center;
}
.foot__brand { display: flex; align-items: center; gap: .7rem; }
.foot__brand img { width: 2rem; height: 2rem; object-fit: cover; object-position: 50% 30%; filter: var(--mark-filter); }
.foot__names { display: flex; flex-direction: column; line-height: 1.3; }
.foot__wm { font-family: var(--f-display); font-weight: 600; font-size: .9375rem; color: var(--ink); }
.foot__studio {
  font-family: var(--f-display);
  font-weight: 500; font-size: .75rem; letter-spacing: .07em;
  color: var(--ink-faint);
}
.foot p, .foot a {
  font-family: var(--f-display);
  font-size: .75rem; font-weight: 500; letter-spacing: .04em;
  color: var(--ink-faint);
}
.foot a { text-decoration: none; }
.foot a:hover { color: var(--ink); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}